Battery device and electric appliance

Abstract

The application provides a battery device and an electric device, wherein the battery device comprises a box body with a containing cavity; the containing cavity comprises an energy bin, and the box body comprises a bottom surface; a bottom guard plate is arranged on the bottom surface of the box body in a first direction; a plurality of battery monomers are arranged in the energy bin; wherein the bottom surface is divided into a first region corresponding to the energy bin and a second region except the first region, and a projection of the bottom guard plate on the bottom surface of the box body covers the first region and only covers part of the second region in the first direction. In this way, the battery monomers can be well protected, energy absorption and protection can be buffered, and the risk of serious deformation of the battery monomers under related working conditions such as ball hitting, which seriously affects the service life, even shell rupture and leakage, can be reduced; and the structural weight of the battery device can be reduced, and the energy density of the battery device can be improved.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery device and an electrical appliance. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. However, the energy density of existing battery devices needs further improvement. Utility Model Content

[0003] The main technical problem addressed by this application is to provide a battery device and electrical equipment that improves the energy density of a battery device.

[0004] To solve the above-mentioned technical problems, in a first aspect, this application adopts a technical solution that provides a battery device, comprising:

[0005] The box body has a receiving cavity; the receiving cavity includes an energy chamber, and the box body includes a bottom surface;

[0006] A bottom protective plate is provided on the bottom surface of the box body along the first direction;

[0007] Several individual battery cells are disposed within the energy chamber;

[0008] The bottom surface is divided into a first region corresponding to the energy chamber and a second region other than the first region. The projection of the bottom guard plate along the first direction on the bottom surface of the box body covers the first region and only partially covers the second region.

[0009] In the above technical solution, the projection of the bottom protective plate on the bottom surface of the box body along the first direction covers the first area of ​​the corresponding energy compartment and only covers a portion of the second area other than the first area. This not only protects the battery cells, buffers and absorbs energy, and reduces the risk of battery cells deforming severely and affecting their lifespan, or even cracking and leaking due to ball impact or other related working conditions; it also reduces the structural weight of the battery device and increases the energy density of the battery device.

[0010] In some embodiments, the box body includes a frame, and the receiving cavity further includes a control compartment; the second region includes a frame region corresponding to the frame and a third region corresponding to the control compartment, wherein,

[0011] The projection of the bottom protective plate along the first direction onto the bottom surface of the box body only covers a portion of the frame area in the second region; or

[0012] The projection of the bottom guard plate along the first direction onto the bottom surface of the box body covers part of the frame area and at least part of the third area in the second region.

[0013] In the above technical solution, the projection of the bottom protective plate along the first direction on the bottom surface of the box body covers only part of the frame area in the second region but not the third region, which can minimize the size of the bottom protective plate and further improve the energy density of the battery device; the projection of the bottom protective plate along the first direction on the bottom surface of the box body also covers at least part of the third region, which can protect the high-voltage control components in the control compartment and increase the overall structural strength of the bottom of the battery device.

[0014] In some embodiments, the bottom protective plate includes a body portion and a plurality of fixing portions disposed at the edge of the body portion; the projection of the fixing portions along the first direction onto the bottom surface of the box body only covers a portion of the frame area.

[0015] In the above technical solution, the projection of the fixing part on the bottom surface of the box body along the first direction only covers part of the frame area, that is, the fixing part is only fixedly connected to the frame of the box body. Considering that when the fixing part is in contact with or on the battery cell, when the battery device is subjected to external force impact, the battery cell is easily squeezed and collided directly, resulting in deformation and breakage of the battery cell, which in turn causes internal short circuits and other safety problems. Therefore, this solution can reduce the contact or collision between the fixing part and the battery cell, and improve the reliability of the battery device.

[0016] In some embodiments, the frame includes a border; the bottom guard plate is an integral structure; the projection of the main body portion along the first direction onto the bottom surface of the box body coincides with the projection of the energy chamber along the first direction onto the bottom surface of the box body, and the fixing portion is mounted on the border.

[0017] In the above technical solution, the bottom guard plate is an integral structure, which has high strength and simplified manufacturing steps.

[0018] In some embodiments, the frame includes a side frame and an internal beam that divides the energy chamber into multiple sub-energy chambers; the bottom cover includes multiple sub-plates; each sub-plate includes the main body and a fixing part disposed at the edge of the main body; the projection of the main body along the first direction onto the bottom surface of the box body coincides with the projection of the sub-energy chamber along the first direction onto the bottom surface of the box body; the fixing part is mounted on the internal beam and the side frame, and / or, the fixing part is mounted on the internal beam.

[0019] In the above technical solution, multiple sub-boards are respectively set up one-to-one with multiple sub-energy chambers, which facilitates maintenance and replacement and can adapt to different shapes or load-bearing requirements; at the same time, it can further reduce the structural weight of the battery device and improve the energy density of the battery device.

[0020] In some embodiments, the battery device further includes:

[0021] A mounting structure is provided on the box body, and the bottom protective plate includes a body part and a fixing part provided on the edge of the body part; the fixing part is installed on the mounting structure.

[0022] In the above technical solution, the fixing part is installed on the mounting structure. This avoids individual battery cells, thereby reducing contact or collision between the fixing part and the battery cells and improving the reliability of the battery device. It achieves both safety protection and utilizes the beam and mounting structure to absorb the Z-axis space required for connection, ensuring a flat bottom.

[0023] In some embodiments, the box body includes a frame and a base plate, the base plate covering the entire frame; the surface of the base plate facing away from the frame serves as the bottom surface of the box body.

[0024] In the above technical solution, the box body further includes a bottom plate, which allows the internal battery cells, high-voltage control components, etc. to be installed and fixed on the bottom plate. At the same time, the bottom plate can work together with the bottom protective plate to resist external physical impacts, vibrations and compressions, and prevent damage to internal components.

[0025] In some embodiments, along the second direction, the edge of the bottom guard plate is spaced from the edge of the bottom surface of the box body; the portion of the bottom surface of the box body extending beyond the edge of the bottom guard plate forms an exposed portion; along the first direction, the bottom guard plate is spaced apart from the bottom surface of the box body; the second direction intersects the first direction;

[0026] The battery device includes an encapsulation structure, one end of which is connected to the edge of the bottom protective plate, and the other end is connected to the exposed portion.

[0027] In the above technical solution, by encapsulating the edge of the bottom protective plate with an encapsulation structure, the risk of foreign objects, such as water, entering between the bottom protective plate and the main body of the box through the edge of the bottom protective plate can be reduced, thereby improving the reliability of the battery device.

[0028] In some embodiments, the encapsulation structure includes:

[0029] The first extension is fitted and fixed to the surface of the bottom protective plate;

[0030] The second extension is fitted and fixed to the bottom surface of the box body;

[0031] A connecting portion that connects the first extension portion and the second extension portion.

[0032] In the above technical solution, the encapsulation structure is attached to the bottom surface of the bottom guard plate and the bottom surface of the box body through the first extension and the second extension, respectively. This can prevent external water, dust and other foreign objects from entering the battery device, reducing the risk of short circuits, corrosion and other problems caused by foreign object intrusion. The design of the connection part allows the encapsulation structure to adapt to the height difference between the bottom guard plate and the box body, improving the reliability of the sealing effect. The encapsulation structure not only plays a sealing role, but also enhances the connection stability between the bottom guard plate and the box body to a certain extent, reducing the loosening of components caused by vibration or impact.

[0033] In some embodiments, the first extension is fitted and fixed to the surface of the bottom guard plate facing the box body, and the first extension has a protrusion that protrudes away from the box body along the first direction.

[0034] Along the second direction, the protrusion covers the gap between the first extension and the bottom protective plate.

[0035] The above technical solution further increases the layers and complexity of the seal, improves the overall sealing performance, and the protrusion helps to reduce corrosion and damage caused by foreign objects such as water between the bottom guard plate and the box body, thereby extending the service life of the battery device.

[0036] In some embodiments, the surface of the protrusion facing away from the box body is flush with the surface of the bottom guard plate facing away from the box body; or, the surface of the protrusion facing away from the box body extends beyond the surface of the bottom guard plate facing away from the box body.

[0037] In the above technical solution, the surface of the protrusion away from the box body is flush with the surface of the bottom guard plate away from the box body, which optimizes aerodynamic performance. The protrusion will fall off due to impact from foreign objects. The surface of the protrusion away from the box body exceeds the surface of the bottom guard plate away from the box body, which can increase the difficulty for external foreign objects to enter and further improve the sealing effect.

[0038] In some embodiments, the first extension is fitted and fixed to the surface of the bottom guard plate opposite to the box body; the second extension is fitted and fixed to the bottom surface of the box body.

[0039] In the above technical solution, the encapsulation structure composed of the first extension, the second extension and the connecting part seals the edge of the bottom protective plate on the same side of the encapsulation structure, which is equivalent to forming a sealing layer on the edge of the bottom protective plate, which can reduce the risk of foreign objects entering the battery device; the encapsulation structure not only plays a sealing and protective role, but also enhances the connection stability between the bottom protective plate and the box body to a certain extent, reducing the loosening of components due to vibration or impact.

[0040] To solve the above-mentioned technical problems, in a second aspect, another technical solution adopted by this application is to provide an electrical device, including the battery device provided in any of the above embodiments.

[0041] In the above technical solution, the projection of the bottom protective plate on the bottom surface of the box body along the first direction covers the first area of ​​the corresponding energy compartment and only covers a portion of the second area other than the first area. This not only protects the battery cells, buffers and absorbs energy, and reduces the risk of battery cells deforming severely and affecting their lifespan, or even cracking and leaking due to ball impact or other related working conditions; it also reduces the structural weight of the battery device and increases the energy density of the battery device.

[0042] In some embodiments, in any embodiment where the battery device has an encapsulation structure, the electrical device is a vehicle, and the encapsulation structure is provided on the edge of the underbody panel along the longitudinal direction of the vehicle; the longitudinal direction of the vehicle is the second direction.

[0043] In the above technical solution, the encapsulation structure can cover the contact surface between the bottom guard plate and the bottom of the box body, which can reduce the risk of water seepage / ingress at this interface when the vehicle is driving through water, and reduce the risk of long-term water accumulation and corrosion at the contact point. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is an exploded view of the battery device provided in some embodiments of this application;

[0046] Figure 2 This is a structural schematic diagram of the bottom surface of the box body in some embodiments of this application;

[0047] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0048] Figure 4An exploded structural diagram of the box body and bottom protective plate provided in some embodiments of this application;

[0049] Figure 5 For this application Figure 4 Bottom view of the middle box body and bottom guard plate;

[0050] Figure 6 This is an exploded structural diagram of the box body and bottom protective plate in other embodiments of this application;

[0051] Figure 7 Bottom view of the box body and bottom guard plate provided for other embodiments of this application;

[0052] Figure 8 A schematic diagram of the assembly structure of the box body and bottom guard plate provided in some embodiments of this application;

[0053] Figure 9 A schematic diagram of the assembly structure of the box body and bottom guard plate provided for other embodiments of this application;

[0054] Figure 10 for Figure 5 The diagram shows a cross-sectional view of the box body and bottom guard plate along line AA.

[0055] Figure 11 A schematic diagram of the assembly structure of the box body and bottom guard plate provided for other embodiments of this application;

[0056] Figure 12 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application.

[0057] Explanation of icon numbers:

[0058] 100-Battery assembly, 10-Box body, 11-Receiving cavity, 110-Energy compartment, 1101-Sub-energy compartment, 111-Control compartment, 12-Bottom surface, 120-First area, 121-Second area, 1210-Frame area, 1211-Third area, 13-First part, 14-Second part, 15-Frame, 150-Side frame, 151-Internal beam, 152-Hanging lug, 16-Exposed part, 20-Battery cell, 21-End cap, 22-Shell, 23- Electrode assembly, 21a-electrode terminal, 23a-tab, 24-connecting member, 25-pressure relief mechanism, 30-bottom protective plate, 31-body part, 310-hollowed-out part, 32-fixing part, 33-subplate, 40-mounting structure, 50-encapsulation structure, 51-first extension, 510-protrusion, 52-second extension, 53-connecting part, 60-connector, 1000-electrical equipment, 200-electrical component; Z-first direction, X-second direction, Y-third direction. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), such as two, three, etc., unless otherwise explicitly defined. Similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple pieces" refers to two or more pieces (including two pieces).

[0063] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the relative orientation or positional relationship between the components in a certain posture (as shown in the accompanying drawings) as shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Among related technologies, battery devices include the casing and the underbody protection plate.

[0067] However, while the bottom plate improves the reliability of the battery device, it also increases the weight of the battery device, which in turn leads to a decrease in energy density.

[0068] To address the aforementioned issues, this application provides a battery device comprising a casing body, a bottom protective plate, and a plurality of battery cells. The casing body has a receiving cavity, which includes an energy compartment. The casing body also includes a bottom surface. The bottom protective plate is disposed on the bottom surface of the casing body along a first direction. The plurality of battery cells are disposed within the energy compartment. The bottom surface is divided into a first region corresponding to the energy compartment and a second region excluding the first region. The projection of the bottom protective plate along the first direction onto the bottom surface of the casing body covers the first region but only partially covers the second region.

[0069] In this embodiment, the projection of the bottom protective plate along the first direction on the bottom surface of the box body covers the first area of ​​the corresponding energy compartment and only covers a portion of the second area other than the first area. This not only protects the battery cells, buffers and absorbs energy, and reduces the risk of battery cells deforming severely and affecting their lifespan, or even cracking and leaking due to ball impact or other related conditions; it also reduces the structural weight of the battery device and increases the energy density of the battery device.

[0070] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0071] Please see Figure 1 and Figure 2 ,in, Figure 1 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of the bottom surface 12 of the box body 10 in some embodiments of this application.

[0072] The battery device 100 provided in this embodiment includes a housing body 10, a bottom protective plate 30, and a plurality of battery cells 20. The housing body 10 has a receiving cavity 11. The receiving cavity 11 includes an energy chamber 110. The housing body 10 includes a bottom surface 12. The bottom protective plate 30 is disposed on the bottom surface 12 of the housing body 10 along a first direction Z. A plurality of battery cells 20 are disposed in the energy chamber 110. The bottom surface 12 is divided into a first region 120 corresponding to the energy chamber 110 and a second region 121 excluding the first region 120. The projection of the bottom protective plate 30 along the first direction Z on the bottom surface 12 of the housing body 10 covers the first region 120 and only partially covers the second region 121.

[0073] The housing body 10 provides a receiving cavity 11 for the battery cells 20. The housing body 10 can adopt various structures. In some embodiments, the housing body 10 may include a first portion 13 and a second portion 14, which overlap each other, jointly defining the receiving cavity 11. The second portion 14 can be a hollow structure with one open end, and the first portion 13 can be a plate-like structure, covering the open side of the second portion 14 so that the first portion 13 and the second portion 14 jointly define the receiving cavity 11. Alternatively, the first portion 13 and the second portion 14 can both be hollow structures with one open side, with the open side of the first portion 13 covering the open side of the second portion 14. Of course, the housing body 10 formed by the first portion 13 and the second portion 14 can be of various shapes, such as a cylinder, a cuboid, etc. The receiving cavity 11 includes an energy chamber 110, which can accommodate a plurality of battery cells 20 arranged in an array. The shape of the energy chamber 110 can be a cylinder or a cuboid, etc. In some embodiments, the housing body 10 includes a bottom surface 12, which is divided into a first region 120 corresponding to the energy storage compartment 110 and a second region 121 excluding the first region 120. The "first region 12 corresponding to the energy storage compartment 110" means that the projection of the energy storage compartment 110 along the first direction Z onto the bottom surface 12 coincides with the first region 120. The "first direction Z" refers to the vertical direction of the battery device 100 during normal operation.

[0074] The bottom protective plate 30 refers to a structural component installed on the bottom surface 12 of the enclosure body 10 to protect the enclosure body 10. The structural strength of the bottom protective plate 30 can be greater than the structural strength of the enclosure body 10. The bottom protective plate 30 can be a metal structural component or a carbon fiber composite structural component, as these materials have good mechanical properties. The projection of the bottom protective plate 30 along the first direction Z onto the bottom surface 12 of the enclosure body 10 covers a first region 120 and only partially covers a second region 121.

[0075] In the battery device 100, several (two or more) battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in both series and parallel. Several battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of these battery cells 20 is housed within the housing body 10. Alternatively, the battery device 100 can also consist of several battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing body 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the several battery cells 20.

[0076] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0077] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0078] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure or impact, allowing battery cell 20 to have higher structural strength and improved stability. Functional components such as electrode terminals 21a can be provided on end cap 21. Electrode terminals 21a can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, battery cell 20 further includes connecting member 24, with one connecting member 24 corresponding to each electrode terminal 21a, or may also be called a current collector, located between end cap 21 and electrode assembly 23, for electrically connecting electrode assembly 23 and electrode terminal 21a. In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism 25 for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap 21. The insulating member can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating member can be plastic, rubber, etc.

[0079] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0080] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 21a to form a current loop.

[0081] In this embodiment, the projection of the bottom protective plate 30 along the first direction Z on the bottom surface 12 of the housing body 10 covers the first region 120 of the corresponding energy chamber 110 and only partially covers the second region 121 excluding the first region 120. This not only protects the battery cell 20, buffers and absorbs energy, and reduces the risk of the battery cell 20 deforming severely and affecting its lifespan under conditions such as ball impact, or even the casing 22 cracking and leaking, but also reduces the structural weight of the battery device 100 and increases the energy density of the battery device 100.

[0082] In addition, due to the high energy density of individual cells, the overall energy density of the assembled cells is also high, and the amount of ineffective space and structural components is reduced, thus improving the assembly efficiency.

[0083] Furthermore, in some embodiments, please refer to... Figure 4 and Figure 5The box body 10 includes a frame 15, and the receiving cavity 11 includes a control compartment 111; the second region 121 includes a frame region 1210 corresponding to the frame 15 and a third region 1211 corresponding to the control compartment 111, wherein the projection of the bottom guard plate 30 along the first direction Z on the bottom surface 12 of the box body 10 only covers part of the frame region 1210 in the second region 121; or the projection of the bottom guard plate 30 along the first direction Z on the bottom surface 12 of the box body 10 covers part of the frame region 1210 and at least part of the third region 1211 in the second region 121.

[0084] The frame 15 forms the skeleton of the housing body 10, providing overall rigidity and impact resistance. The frame 15 can be a metal structural component or a composite material structural component. The housing cavity 11 includes a control compartment 111, which is used to house high-voltage control components such as the battery management system (BMS) and high-voltage box.

[0085] The second region 121 includes a frame region 1210 corresponding to the frame 15 and a third region 1211 corresponding to the control compartment 111. The "frame region 1210 corresponding to the frame 15" means that the projection of the frame 15 along the first direction Z on the bottom surface 12 of the box body 10 coincides with the frame region 1210. The "third region 1211 corresponding to the control compartment 111" means that the projection of the control compartment 111 along the first direction Z on the bottom surface 12 of the box body 10 coincides with the third region 1211.

[0086] In this embodiment, the projection of the bottom protective plate 30 along the first direction Z onto the bottom surface 12 of the housing body 10 covers only a portion of the frame area 1210 in the second region 121 but not the third region 1211, which can minimize the size of the bottom protective plate 30 and further improve the energy density of the battery device 100. The projection of the bottom protective plate 30 along the first direction Z onto the bottom surface 12 of the housing body 10 also covers at least a portion of the third region 1211, which can protect the high-voltage control components in the control compartment 111 and increase the overall structural strength of the bottom of the battery device 100.

[0087] Furthermore, in some embodiments, the bottom guard plate 30 includes a body portion 31 and a plurality of fixing portions 32 disposed on the edge of the body portion 31; the projection of the fixing portions 32 along the first direction Z on the bottom surface 12 of the box body 10 only covers a portion of the frame area 1210.

[0088] Among them, the main body 31 is the core structure of the bottom protective plate 30, which can withstand impacts, friction and foreign object impacts from the bottom, protect the bottom and internal components of the box body 10, and at the same time play a certain role in heat insulation, waterproofing and dustproofing.

[0089] The fixing part 32 is a protrusion provided on the edge of the body part 31, used to install and fix the body part 31 to the bottom of the box body 10. The fixing part 32 can be a flat structure such as rectangular, strip-shaped, hollow ring, or hollow ring-rectangular. In some embodiments, the fixing part 32 can be a metal structural component and welded to the bottom surface 12 of the box body 10 corresponding to a portion of the frame area 1210. The fixing part 32 is connected to the body part 31, and the connection method between the two may be welding, bolting, or integral molding. In this embodiment, the fixing part 32 is integrally molded with the body part 31, which helps to enhance the stability of the overall structure and improve the impact resistance of the bottom guard plate 30.

[0090] In this embodiment, the projection of the fixing part 32 along the first direction Z on the bottom surface 12 of the box body 10 only covers a portion of the frame area 1210, that is, the fixing part 32 is only fixedly connected to the frame 15 of the box body 10. Considering that when the fixing part 32 is in contact with or on the battery cell 20, when the battery device 100 is subjected to external force impact, the battery cell 20 is easily directly squeezed or collided, causing the battery cell 20 to deform or break, thereby causing internal short circuits and other safety problems, this embodiment can reduce the contact or collision between the fixing part 32 and the battery cell 20, thereby improving the reliability of the battery device 100.

[0091] Alternatively, in some embodiments, please continue to refer to Figure 4 The frame 15 includes a side frame 150; the bottom guard plate 30 is an integral structure; the projection of the main body 31 along the first direction Z on the bottom surface 12 of the box body 10 coincides with the projection of the energy chamber 110 along the first direction Z on the bottom surface 12 of the box body 10; and the fixing part 32 is installed on the side frame 150.

[0092] The frame 150 forms the boundary of the box body 10, providing a stable boundary structure for the entire box body 10. The bottom protective plate 30 is a monolithic structure, meaning it is an indivisible whole component. Its material, shape, and size are uniform and continuous; it is not composed of multiple small parts pieced together, but rather molded as a single piece, thus ensuring its structural integrity and stability. Such a structure can evenly distribute stress under load, reducing weak points caused by joints.

[0093] Optionally, in some embodiments, the energy chamber 110 has an internal beam 151, and the body portion 31 covers part of the internal beam 151 or has a corresponding perforated portion 310. The perforated portion 310 can achieve the effects of weight reduction and drainage. The body portion 31 coincides with the outline of the energy chamber 110. In some embodiments, the body portion 31 and the outline of the energy chamber 110 can be connected or welded together by a connector 60 (such as a screw). The bottom protective plate 30 can be fixed as an integral structure to the frame 150 and the internal beam 151.

[0094] In this embodiment, the bottom protective plate 30 is an integral structure, which has high strength and simplified manufacturing steps.

[0095] Optionally, in some embodiments, please also refer to Figure 6 and Figure 7 The frame 15 includes a side frame 150 and an internal beam 151, which divides the energy chamber 110 into multiple sub-energy chambers 1101. The bottom protective plate 30 includes multiple sub-plates 33. Each sub-plate 33 includes a body portion 31 and a fixing portion 32 disposed on the edge of the body portion 31. The projection of the body portion 31 along the first direction Z on the bottom surface 12 of the box body 10 coincides with the projection of the sub-energy chamber 1101 along the first direction Z on the bottom surface 12 of the box body 10. The fixing portion 32 is installed on the internal beam 151 and the side frame 150, and / or, the fixing portion 32 is installed on the internal beam 151.

[0096] The internal beam 151 is a beam-like structure spanning the side walls of the housing body 10. The internal beam 151 can be classified according to function as an expansion beam or a reinforcing beam. The receiving cavity 11 within the housing body 10 can be divided into two parts by a portion of the internal beam 151 (e.g., an expansion beam): one part is the energy chamber 110 defined by the internal beam 151 together with the side walls and bottom wall of the housing body 10, and the other part is the control chamber 111. The internal beam 151 can be made of sheet metal or extruded profile. The internal beam 151 can be a metal structural component or a non-metallic composite material structural component. In some embodiments of this application, a portion of the internal beam 151 is a non-metallic composite material structural component, which can be a resin and fiber composite material structural component, such as a carbon fiber reinforced resin structural component or a glass fiber reinforced resin structural component. In some embodiments, a portion of the internal beam 151 can be used to buffer the compressive force when the battery cell 20 expands, and is configured to bend and deform as the battery cell 20 within the energy chamber 110 expands.

[0097] In some embodiments, the number of internal beams 151 (e.g., reinforcing beams) can be multiple. These multiple internal beams 151 are intersecting and spaced along the second direction X and the third direction Y within the energy chamber 110, thereby dividing the energy chamber 110 into multiple sub-energy chambers 1101. Each sub-energy chamber 1101 can be arranged with several battery cells 20 in an array. The cross-sectional shape of the sub-energy chamber 1101 can be set as needed, such as rectangular, square, rhomboid, parallelogram, regular polygon, or circular. In some embodiments of this application, the cross-sectional shape of the sub-energy chamber 1101 is rectangular. In this embodiment, the second direction X is the horizontal direction when the battery device 100 is operating normally. Figure 6 In the left and right directions, the third direction Y is the horizontal direction when the battery device 100 is working normally. Figure 6The front and back directions in the middle.

[0098] The bottom protective plate 30 includes multiple sub-plates 33. The number of sub-plates 33 and the number of sub-energy chambers 1101 can be the same. In some embodiments, the sub-plates 33 and sub-energy chambers 1101 are arranged in a one-to-one correspondence. Each sub-plate 33 is used to protect the battery cell 20 in the corresponding sub-energy chamber 1101, withstand various impacts, friction and foreign object impacts from the bottom, and at the same time play a certain role in heat insulation, waterproofing and dustproofing.

[0099] Each sub-plate 33 includes a body portion 31 and a fixing portion 32 disposed at the edge of the body portion 31. The projection of the body portion 31 along the first direction Z onto the bottom surface 12 of the housing body 10 coincides with the projection of the sub-energy compartment 1101 along the first direction Z onto the bottom surface 12 of the housing body 10, serving to protect the sub-energy compartment 1101. In some embodiments, the sub-energy compartment 1101 is defined by internal beams 151 and a frame 150, and the fixing portion 32 is mounted on the internal beams 151 and the frame 150. In other embodiments, the sub-energy compartment 1101 is defined by a plurality of internal beams 151, and the fixing portion 32 is mounted on the internal beams 151.

[0100] In this way, multiple sub-boards 33 are respectively set up one-to-one with multiple sub-energy chambers 1101, which facilitates maintenance and replacement and can be adapted to different shapes or load-bearing requirements; at the same time, it can further reduce the structural weight of the battery device 100 and increase the energy density of the battery device 100.

[0101] In some embodiments, please also refer to Figure 4 and Figure 6 The battery device 100 further includes a mounting structure 40; the mounting structure 40 is disposed on the box body 10, and the bottom guard plate 30 includes a body part 31 and a fixing part 32 disposed on the edge of the body part 31; the fixing part 32 can be installed on the mounting structure 40.

[0102] The mounting structure 40 is disposed on the box body 10. In some embodiments, the mounting structure 40 is located on both sides or the bottom edge of the box body 10, and can serve as a support point for connecting and fixing the bottom guard plate 30.

[0103] In this way, the battery cell 20 can be avoided, thereby reducing the contact or collision between the fixing part 32 and the battery cell 20, improving the reliability of the battery device 100. In addition, the space required for connection in the first direction Z can be absorbed by the internal beam 151 and the mounting structure 40, making the bottom flat.

[0104] Alternatively, in some embodiments, please refer to Figure 8 The box body 10 includes a frame 15 and a bottom plate 16, with the bottom plate 16 covering the entire frame 15; the surface of the bottom plate 16 facing away from the frame 15 serves as the bottom surface 12 of the box body 10.

[0105] The base plate 16 can be a plate-like structure; in some embodiments, the base plate 16 can be a metal plate. The space enclosed by the base plate 16 and the frame 15 can be used to accommodate battery cells 20, etc. The frame 15 may include a frame 150 and internal beams 151.

[0106] Optionally, in some embodiments, please also refer to Figure 9 The base plate 16 can be a water-cooled plate. The two sides of the frame 150 can be provided with mounting ears 152, and the bottom guard plate 30 can be installed on the mounting ears 152.

[0107] In this embodiment, the box body 10 further includes a bottom plate 16, which allows the internal battery cells 20, high-voltage control components, etc. to be installed and fixed on the bottom plate 16. At the same time, the bottom plate 16 can work together with the bottom protective plate 30 to resist external physical impacts, vibrations and compressions, and prevent damage to internal components.

[0108] Optionally, in some embodiments, please also refer to Figure 10 , Figure 10 for Figure 5 The diagram shows a cross-sectional view of the box body and bottom guard plate along line AA.

[0109] Along the second direction X, the edge of the bottom protective plate 30 is spaced from the edge of the bottom surface 12 of the case body 10; the portion of the bottom surface 12 of the case body 10 that extends beyond the edge of the bottom protective plate 30 forms an exposed portion 16; along the first direction Z, the bottom protective plate 30 and the bottom surface 12 of the case body 10 are spaced apart; the second direction X intersects the first direction Z; the battery device 100 further includes an encapsulation structure 50, one end of which is the edge of the bottom protective plate 30, and the other end is connected to the edge of the exposed portion 16.

[0110] The projection of the bottom protective plate 30 onto the bottom surface 12 of the housing body 10 along the first direction Z covers the second region 121. Furthermore, along the second direction X, the edge of the bottom protective plate 30 is spaced from the edge of the bottom surface 12 of the housing body 10. Thus, the size of the bottom protective plate 30 is smaller than the size of the bottom surface 12 of the housing body 10, reducing the weight of the battery device 100. The bottom protective plate 30 is spaced apart from the bottom surface 12 of the housing body 10 along the first direction Z, creating a gap between them. This gap absorbs energy acting on the bottom protective plate 30, providing a buffer and energy absorption effect when the bottom protective plate 30 is subjected to external pressure or impact, thereby reducing the risk of the housing body 10 collapsing or deforming.

[0111] The encapsulation structure 50 refers to the structural component that seals the edge of the bottom protective plate 30. Considering that the bottom protective plate 30 is attached to the bottom surface 12 of the box body 10, the joint is prone to water accumulation due to water immersion or humid environments, which can easily lead to corrosion or seal failure. In this embodiment, the size of the bottom protective plate 30 is smaller than the size of the bottom surface 12 of the box body 10, allowing a space in the first direction Z (vertical direction) to be formed at their edges. For example, the bottom protective plate 30 is recessed 20mm from the bottom surface 12 of the box body 10 on all sides, creating a height space (e.g., 10mm) to accommodate the encapsulation structure 50, which is located at the joint between the edge of the bottom protective plate 30 and the bottom surface 12 of the box body 10.

[0112] This reduces the risk of foreign objects, such as water, entering between the bottom guard plate 30 and the housing body 10 through the edge of the bottom guard plate 30, thereby improving the reliability of the battery device 100.

[0113] Furthermore, in some embodiments, please continue to refer to Figure 10 The encapsulation structure 50 includes a first extension 51, a second extension 52, and a connecting part 53; the first extension 51 is attached to and fixed to the surface of the bottom guard plate 30; the second extension 52 is attached to and fixed to the bottom surface 12 of the box body 10; and the connecting part 53 connects the first extension 51 and the second extension 52.

[0114] The first extension 51 is attached to and fixed to the surface of the bottom protective plate 30, and the second extension 52 is attached to and fixed to the bottom surface 12 of the box body 10. Both the first extension 51 and the second extension 52 can be sheet-like or plate-like structures. The first extension 51 can be a metal structural component or a composite material structural component. The metal structural component has better mechanical properties, while the composite material structural component has better elasticity and weather resistance, and can adapt to different environmental conditions.

[0115] The connecting part 53 connects the first extension 51 and the second extension 52, and is a transition structure. It can be flat, curved, or polygonal, and its specific shape depends on the shape of the gap between the bottom guard plate 30 and the box body 10. The first extension 51, the second extension 52, and the connecting part 53 can be an integrally formed structure, such as an integral structure formed by bending or stamping technology.

[0116] In this embodiment, the encapsulation structure 50 is attached to the bottom plate 30 and the bottom surface 12 of the box body 10 through the first extension 51 and the second extension 52 respectively. This can prevent external water, dust and other foreign objects from entering the battery device 100, reducing the risk of short circuits, corrosion and other problems caused by foreign object intrusion. The design of the connecting part 53 allows the encapsulation structure 50 to adapt to the height difference between the bottom plate 30 and the box body 10, improving the reliability of the sealing effect. The encapsulation structure 50 not only plays a sealing role, but also enhances the connection stability between the bottom plate 30 and the box body 10 to a certain extent, reducing the loosening of components caused by vibration or impact.

[0117] In some embodiments, see Figure 11 , Figure 11 This is a schematic diagram of the assembly structure of the box body and bottom guard plate provided for other embodiments of this application.

[0118] In this embodiment, the first extension 51 is attached to and fixed to the surface of the bottom guard plate 30 facing the box body 10, and the first extension 51 has a protrusion 510 protruding from the side opposite to the box body 10 along the first direction Z; wherein, along the second direction X, the protrusion 510 covers the fitting gap between the first extension 51 and the bottom guard plate 30.

[0119] The protrusion 510 is a shielding structure that protrudes from the surface of the first extension 51 along the first direction Z (vertical direction) away from the box body 10. The protrusion 510 can be a semi-circular protrusion or a trapezoidal edge.

[0120] This further increases the layers and complexity of the seal, improves the overall sealing performance, and the protrusion 510 helps reduce corrosion and damage between the bottom guard plate 30 and the box body 10 caused by foreign objects such as water, thereby extending the service life of the battery device 100.

[0121] In some embodiments, the surface of the protrusion 510 away from the box body 10 is flush with the surface of the bottom guard plate 30 away from the box body 10; or, the surface of the protrusion 510 away from the box body 10 extends beyond the surface of the bottom guard plate 30 away from the box body 10.

[0122] The surface of the protrusion 510 facing away from the body 10 is flush with the surface of the underbody 30 facing away from the body 10, meaning that the top surface of the protrusion 510 and the bottom surface 12 of the underbody 30 are on the same plane. This helps to reduce air resistance during vehicle operation and improve the vehicle's aerodynamic performance.

[0123] The surface of the protrusion 510 facing away from the body 10 extends beyond the surface of the bottom guard plate 30 facing away from the body 10, meaning the top surface of the protrusion 510 is higher than the bottom surface 12 of the bottom guard plate 30. In this way, the surface of the protrusion 510 facing away from the body 10 can first contact external impacting objects, such as stones or mud, thereby buffering and dispersing the impact force and protecting the bottom guard plate 30 and the body 10 from direct impact. In rainy weather or when driving through water, the protrusion 510 can guide the water flow, reducing the direct impact of water on the contact surface between the bottom guard plate 30 and the body 10, thus reducing the risk of water ingress. The height difference of the protrusion 510 increases the difficulty for external foreign objects to enter, further improving the sealing effect.

[0124] In this embodiment, the surface of the protrusion 510 away from the box body 10 is flush with the surface of the bottom guard plate 30 away from the box body 10, thus optimizing aerodynamic performance; the surface of the protrusion 510 away from the box body 10 extends beyond the surface of the bottom guard plate 30 away from the box body 10, which can increase the difficulty for external foreign objects to enter and further improve the sealing effect.

[0125] In some embodiments, the first extension 51 is attached to and fixed to the surface of the bottom guard plate 30 away from the box body 10; the second extension 52 is attached to and fixed to the bottom surface 12 of the box body 10.

[0126] Thus, the encapsulation structure 50, composed of the first extension 51, the second extension 52, and the connecting part 53, seals the edge of the bottom protective plate 30 on the same side of the encapsulation structure 50, which is equivalent to forming a sealing layer on the edge of the bottom protective plate 30, thereby reducing the risk of foreign objects entering the battery device 100. The encapsulation structure 50 not only plays a sealing and protective role, but also enhances the connection stability between the bottom protective plate 30 and the box body 10 to a certain extent, reducing the loosening of components due to vibration or impact.

[0127] Please see Figure 12 Some embodiments of this application provide an electrical device 1000, which includes a battery device 100. The battery device 100 can be any of the battery devices 100 provided in the foregoing embodiments.

[0128] Electrical equipment 1000 can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. For ease of explanation, the following embodiments use a vehicle as an example for electrical equipment 1000.

[0129] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source.

[0130] Electrical equipment 1000 may also include an electrical component 200, to which the battery device 100 is electrically connected. The electrical component 200 may be an electrical element or device. The electrical component 200 may be a controller or electronic component, etc. The controller may be a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0131] The battery device 100 can be a device capable of providing electrical energy to the electrical device 200. In some embodiments of this application, the battery device 100 can serve not only as the operating power source of the vehicle but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. Furthermore, the electrical device 1000 can be a vehicle, and the electrical device 200 can be the vehicle's lights (e.g., headlights, taillights, etc.), display screen, dashboard, control system (e.g., controller), etc. The electrical device 1000 may also include other parts, such as a vehicle frame, with both the battery device 100 and the electrical device 200 mounted on the vehicle body.

[0132] In some embodiments, in any embodiment where the battery device 100 has an encapsulation structure 50, the electrical device 1000 is a vehicle, and the edges of the underbody 30 are provided with encapsulation structures 50 along the front-rear direction of the vehicle; the front-rear direction of the vehicle is the second direction X.

[0133] The forward and backward direction of the vehicle is the same as the direction corresponding to the front of the vehicle, which is the subject of this application. Figure 1 , Figure 4 , Figure 6 , Figure 10 and Figure 11 The second direction X in the equation.

[0134] Thus, the encapsulation structure 50 can cover the contact surface between the bottom guard plate 30 and the bottom of the box body, which can reduce the risk of water seepage / ingress at this interface when the vehicle is driving through water, and reduce the risk of long-term water accumulation and corrosion at the contact point.

[0135] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0136] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0137] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A battery device, characterized in that, include: The box body has a receiving cavity; the receiving cavity includes an energy chamber, and the box body includes a bottom surface; A bottom protective plate is provided on the bottom surface of the box body along the first direction; Several individual battery cells are disposed within the energy chamber; The bottom surface is divided into a first region corresponding to the energy chamber and a second region other than the first region. The projection of the bottom guard plate along the first direction on the bottom surface of the box body covers the first region and only partially covers the second region.

2. The battery device according to claim 1, characterized in that, The box body includes a frame, and the receiving cavity further includes a control compartment; the second region includes a frame region corresponding to the frame and a third region corresponding to the control compartment, wherein, The projection of the bottom protective plate along the first direction onto the bottom surface of the box body only covers a portion of the frame area in the second region; or The projection of the bottom guard plate along the first direction onto the bottom surface of the box body covers part of the frame area and at least part of the third area in the second region.

3. The battery device according to claim 2, characterized in that, The bottom protective plate includes a main body and a plurality of fixing parts disposed on the edge of the main body; the projection of the fixing parts along the first direction on the bottom surface of the box body only covers a portion of the frame area.

4. The battery device according to claim 3, characterized in that, The frame includes a border; the bottom protective plate is an integral structure; the projection of the main body part along the first direction onto the bottom surface of the box body coincides with the projection of the energy chamber along the first direction onto the bottom surface of the box body, and the fixing part is installed on the border.

5. The battery device according to claim 3, characterized in that, The frame includes a side frame and an internal beam, the internal beam dividing the energy chamber into multiple sub-energy chambers; the bottom protective plate includes multiple sub-plates; each sub-plate includes the main body and the fixing part disposed on the edge of the main body; the projection of the main body along the first direction on the bottom surface of the box body coincides with the projection of the sub-energy chamber along the first direction on the bottom surface of the box body; the fixing part is installed on the internal beam and the side frame, and / or, the fixing part is installed on the internal beam.

6. The battery device according to claim 1, characterized in that, Further including A mounting structure is provided on the box body, and the bottom protective plate includes a body part and a fixing part provided on the edge of the body part; the fixing part is installed on the mounting structure.

7. The battery device according to claim 1, characterized in that, The box body includes a frame and a bottom plate, the bottom plate covering the entire frame; the surface of the bottom plate facing away from the frame serves as the bottom surface of the box body.

8. The battery device according to any one of claims 1-7, characterized in that, Along the second direction, the edge of the bottom guard plate is spaced from the edge of the bottom surface of the box body; the portion of the bottom surface of the box body that extends beyond the edge of the bottom guard plate forms an exposed portion; along the first direction, the bottom guard plate and the bottom surface of the box body are spaced apart; the second direction intersects the first direction; The battery device includes an encapsulation structure, one end of which is connected to the edge of the bottom protective plate, and the other end is connected to the exposed portion.

9. The battery device according to claim 8, characterized in that, The encapsulation structure includes: The first extension is fitted and fixed to any surface of the bottom protective plate; The second extension is fitted and fixed to the bottom surface of the box body; A connecting portion that connects the first extension portion and the second extension portion.

10. The battery device according to claim 9, characterized in that, The first extension is attached to and fixed to the surface of the bottom protective plate facing the box body, and the first extension has a protrusion that protrudes away from the box body along the first direction. Along the second direction, the protrusion covers the gap between the first extension and the bottom protective plate.

11. The battery device according to claim 10, characterized in that, The surface of the protrusion facing away from the box body is flush with the surface of the bottom guard plate facing away from the box body; or, the surface of the protrusion facing away from the box body extends beyond the surface of the bottom guard plate facing away from the box body.

12. The battery device according to claim 9, characterized in that, The first extension is attached to and fixed to the surface of the bottom protective plate opposite to the box body; the second extension is attached to and fixed to the bottom surface of the box body.

13. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-12.

14. The electrical equipment according to claim 13, characterized in that, Along the second direction, the edge of the bottom guard plate is spaced from the edge of the bottom surface of the box body; the portion of the bottom surface of the box body that extends beyond the edge of the bottom guard plate forms an exposed portion; along the first direction, the bottom guard plate and the bottom surface of the box body are spaced apart; the second direction intersects the first direction; The battery device includes an encapsulation structure, one end of which is connected to the edge of the bottom protective plate, and the other end is connected to the exposed portion; The electrical equipment is a vehicle, and the encapsulation structure is provided on the edge of the bottom guard plate along the front-rear direction of the vehicle; the front-rear direction of the vehicle is the second direction.

Images